I found that Adele's songs(someone like you) was a very popular one. It wasn't hard to play either. Also, the newer songs, like Rihanna's song, stay, but it was tricky, the song has lots of flats. Bruno Mars' song, when i was your man, was not that hard either. But I would suggest Katy Perry Firework. Easy, but takes time to perfect it.
"Tea for Two" sounds really great on piano . Get the sheet music and learn to play it. You will attract attention and admiration. Watch Nat King Cole play it on You tube and you will see. Also find Tea for Two piano tutorial on You Tube.